Hesitant power take-up

[Strasse109]

Hi folks, seeking some views on an annoyance to my driving pleasure.

Decided to take my 2014 35is out of hibernation early as we have had a few chilly but nice days.

The car starts at first touch of button from cold and idles smooth but fast as can be expected. However, when I first pull away there is a slight hesitancy in power take-up in first and second gear (DCT)as if the engine is missing. When I stop at a junction and start to pull away get that same hesitancy and missing. Its as if in first or second, it’s not getting the gear straight away.

There are no EML or other lights and have scanned with ‘Autel’ and “Launch’ but no code are shown. I’m at a loss the engine is awesome once moving and delivers smooth linear power.

The only issue which makes me still look at the engine is that once used and nice and warm if I stop the car and come back after 20 minutes it takes a lot of cranking before it eventually splutters and fires, thereafter it smooth as silk. I’m running index 12 injectors and replaced the plugs 5000 miles ago, car has done 32K.

Anyone got any pointers or should I be looking towards the gearbox.

[B21]

Sounds like a failing index 12 injector…they are still known to fail..could be HPFP but no codes and age of car mitigate against that diagnosis

[Strasse109]

Thanks for your thoughts, will bite the bullet and get it booked in at the dealer. Just looked at my BMW warranty and pretty sure it covers most things so will take a chance.

[mcbutler]

You need to run some live data - do you have MHD?
Data from low and HP fuel pumps and fuel trims etc whilst the problem is occuring.
I woudnt be thinking HPFP as the cars not under any real load.
You need hard data bud.

If you do have a duff index 12 it will have a two year warranty if bought from BMW.
If its leaking after engine shut off the fuel maybe running down the bore into the sump causing oil dillution eventually!!!!

[mcbutler]

Hi folks, seeking some views on an annoyance to my driving pleasure.

Decided to take my 2014 35is out of hibernation early as we have had a few chilly but nice days.

The car starts at first touch of button from cold and idles smooth but fast as can be expected. However, when I first pull away there is a slight hesitancy in power take-up in first and second gear (DCT)as if the engine is missing. When I stop at a junction and start to pull away get that same hesitancy and missing. Its as if in first or second, it’s not getting the gear straight away.

There are no EML or other lights and have scanned with ‘Autel’ and “Launch’ but no code are shown. I’m at a loss the engine is awesome once moving and delivers smooth linear power.

The only issue which makes me still look at the engine is that once used and nice and warm if I stop the car and come back after 20 minutes it takes a lot of cranking before it eventually splutters and fires, thereafter it smooth as silk. I’m running index 12 injectors and replaced the plugs 5000 miles ago, car has done 32K.

Anyone got any pointers or should I be looking towards the gearbox.

Did you solve this issue??

[Strasse109]

The car went in to BMW for service a few weeks ago and I flagged the issue to them. They had the car for two days and as I was expecting no fault found. I spoke to the service agent part way through and everything we thought it was had been checked and no fault. At least they found the misting adaptive shock absorber and changed that under warranty. The downside or upside whichever way you look at it is they loaned me a new G29 M40i, well that did it. No longer have any issues with the E89 as I swapped it for a M40i, expensive way to solve a problem but hey, life's too short.

[Argyll Andy]

The car went in to BMW for service a few weeks ago and I flagged the issue to them. They had the car for two days and as I was expecting no fault found. I spoke to the service agent part way through and everything we thought it was had been checked and no fault. At least they found the misting adaptive shock absorber and changed that under warranty. The downside or upside whichever way you look at it is they loaned me a new G29 M40i, well that did it. No longer have any issues with the E89 as I swapped it for a M40i, expensive way to solve a problem but hey, life's too short.

Definitely an upside, you’ll love the M40i I’m sure you’re absolutely correct, life’s too short, enjoy

What colour and spec did you get? A picture would be nice too